CHICAGO -- U.S. Bank filed papers Tuesday disputing Syncora Guarantee Inc.’s account of the bank’s role in a court battle between the bond insurer and Detroit over the use of casino revenues.

In its filing, U.S. Bank, which acts as a custodian on the city’s interest-rate swaps, said it has not weighed in on whether the city triggered a default under the swap agreement, contradicting Syncora’s assertion that the bank confirmed the default.

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